The Coast Guard says the Titan submersible likely imploded in the North Atlantic waters and there were no survivors among the five people aboard.
The implosion likely occurred near the Titanic shipwreck, where the submersible was headed.
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"The debris is consistent with the catastrophic loss of the pressure chamber," Rear Adm. John Mauger, the First Coast Guard District, said Thursday. "Our most heartfelt condolences go out to the loved ones of the crew."